Not sure if Core realizes this, but with a 6 person Conservative Supreme Court, you will never get M4A, or comprehensive CJR, or anything else. Furthermore, Trump will continue to erode voting rights. Good luck getting a progressive elected when more black people can't vote.
Even strategically, this is a really, really stupid decision. It doesn't make sense at all. I'll concede that Trump winning in 2020 probably makes it more likely that a progressive wins in 2024. But the risk is so high, and the cost so large, that it's not worth it, not even close. Politics isn't a binary. Capitalists bad, anti-capitalists good. Biden's not the ideal candidate, but the difference between him and Trump is large enough that it outweighs the small chance that a progressive wins in 2024.
Any basic risk analysis would find that your best option is voting for Biden.